difference between ocr and voting disk

If the crsd process running on the node affected by the Oracle ASM instance failure is the OCR writer, the majority of the OCR locations are stored in Oracle ASM, and you attempt I/O on OCR during the time the Oracle ASM instance is down on this node, then crsd stops and becomes inoperable. Begin to start Oracle Clusterware by running the following command as root on all of the nodes: Verify OCR integrity of all of the cluster nodes that are configured as part of your cluster by running the following CVU command: Use the following procedure to restore OCR on Windows systems: Stop Oracle Clusterware by running the following command as a member of the Administrators group on all of the nodes: If the preceding command returns any error due to OCR corruption, stop Oracle Clusterware by running the following command as a member of the Administrators group on all of the nodes: Start the Oracle Clusterware stack on one node in exclusive mode by running the following command as a member of the Administrators group: Restore OCR with the OCR backup file that you identified in "Listing Backup Files" by running the following command as a member of the Administrators group: Make sure that the OCR devices that you specify in the OCR configuration exist and that these OCR devices are valid. That is to say, as long as you have the latest OCR backup, you automatically have voting disk backup too. Nodes have split into N sets of nodes, communicating within the set, but not with members in another set.2. Ensure there is at least 280 MB of space on the mount partition. user13389425 Sep 7 2010 edited Sep 7 2010. Change). Perform this operation on every voting disk as needed where voting_disk_name is the name of the active voting disk and backup_file_name is the name of the file to which you want to back up the voting disk contents: Run the following command to recover a voting disk where backup_file_name is the name of the voting disk backup file and voting_disk_name is the name of the active voting disk: Hope you like the information onvoting disks in RAC. Check the SPFILE location. The voting disk is a file that manages information about node membership, and the OCR is a file that manages the cluster and Real Application Clusters (RAC) database configuration information. What is NETWORK and DISK HEARTBEAT and how does it register in VOTING DISKS/FILES? It was introduced in 11gR2, and is not shared by any other node in the cluster. You can manually put the mirrored OCRs on a shared network file system (NFS), or on any cluster file system that is certified by Oracle. For steps on this check the documentation: Oracle Database Oracle Clusterware and Oracle Real Application Clusters Administration and Deployment Guide. Ensure that the Oracle ASM disk group you specify exists and is mounted. [grid@RAC1 ~]$ asmcmd spget --Connect with SQLPLUS ASM instance OCR has a mechanism that prevents data loss due to accidental overwrites. You can check the status of OLR on the local node using the OCRCHECK utility, as follows: You can display the content of OLR on the local node to the text terminal that initiated the program using the OCRDUMP utility, as follows: You can perform administrative tasks on OLR on the local node using the OCRCONFIG utility. Optical Mark Reader (OMR) is the technology of electronically extracting data from marked fields such as checkboxes or bubbles from pre-printed forms. You can just replace with new voting file on disk group DATA. Make sure that xdpyinfo exist under PATH variable. In 10g, Oracle Clusterware can support 32 voting disks but in 11g R 2 supports 15 voting disks. You must shut down Oracle Clusterware on all nodes in the cluster to get a consistent snapshot using the ocrconfig -export command. such as Oracle RAC databases, listeners, virtual IP addresses (VIPs), and services and any applications. If an OCR location suddenly becomes unavailable, then it might take a short period for Oracle Clusterware to show the change in status. WebOracle Clusterware includes two important components that manage configuration and node membership: Oracle Cluster Registry (OCR), which also includes the local component Oracle Local Registry (OLR), and voting files. A normal redundancy disk group must contain at least two failure groups but if you are storing your voting disks on Oracle ASM, then a normal redundancy disk group must contain at least three failure groups. Restoring the Oracle Cluster Registry on Linux or UNIX Systems, Restoring the Oracle Cluster Registry on Windows Systems, Restoring the Oracle Cluster Registry in an Oracle Restart Environment. To remove storage configurations no longer in use, run the following command as root: Run this command for every configured OCR. Oracle Cluster Registry (OCR) which records cluster configuration information. However, if you are unable to start any cluster node in your environment and if you can neither repair OCR nor restore access to all OCR locations, then you can override the protection mechanism. This chapter includes the following topics: Managing Oracle Cluster Registry and Oracle Local Registry. The OCR cache is updated by the master CRSd process to make is visible to all the nodes in the cluster. Oracle recommends that you use either automatic or manual backups, and the ocrconfig -restore command instead of the ocrconfig -export and ocrconfig -import commands to restore OCR for the following reasons: A backup is a consistent snapshot of OCR, whereas an export is not. We and our partners share information on your use of this website to help improve your experience. It is the rapid method of data entry. Note: In Shared storage you should create 3 minimum voting files in separate storage. Save my name, email, and website in this browser for the next time I comment. It records the data where marks are made on the form. For DBAs planning to use ScaleIO snapshots, a two-diskgroup solution should be considered the minimum, but control files and redo logs should NOT be mirrored to both diskgroups. For example: Using the ocrconfig -export command also enables you to restore OCR using the -import option if your configuration changes cause errors. OCR stores Oracle Clusterware and Oracle RAC database configuration information It is hard to implement as compared to OMR. If the configurations match, ensure that the node can access all of the configured OCRs by running an ls command on Linux and UNIX systems. If it is, stop it by running the following command as root: Import OCR by running the following command as root: If you are importing OCR to a cluster or network file system, then skip to step 7. If this problem is local to only one node, you can use other nodes to start your cluster database. Check the Voting Disk Location The game features a fantasy space odyssey story with turn-based combat, and you can play it without spending a single cent on gacha. Learn Oracle, PHP, HTML,CSS,Perl,UNIX shell scripts, March 19, 2017 by techgoeasy Leave a Comment. It records the data where marks are made on the form. 3. If you upgrade from a previous version of Oracle Clusterware to Oracle Clusterware 11g release 2 (11.2) and you want to store voting disks in an Oracle ASM disk group, then you must set the ASM Compatibility (COMPATIBLE.ASM) compatibility attribute to 11.2.0.0. d) All nodes in the RAC cluster register their heartbeat information in the voting disks/files. (LogOut/ Mirroring can help prevent OCR from becoming a single point of failure. This article is intended for DBA and Support Engineers who need to modify, or move OCR and voting disks files, customers who have an existing clustered environment deployed on a storage array and might want to migrate to a new storage array with minimal downtime. In Oracle Clusterware 11g release 2 (11.2), you no longer have to back up the voting disk. Backups are created when the system is online. Oracle strongly recommends that you mirror OCR if the underlying storage is not RAID. such as Oracle RAC databases, listeners, virtual IP addresses (VIPs), and services and any applications. To add an OCRMIRROR device when only OCR device is defined: 3. Multiple processes on each node have simultaneous read and write access to the OLR particular to the node on which they reside, regardless of whether Oracle Clusterware is running or fully functional. CSS service is sending heartbeat messages through the network and voting disk.In a situation, when due to private network failure, nodes are not able to synchronize I/O to the shared disks, Therefore some of the nodes will be going to the offline stage. "Administering Oracle Cluster Registry with Oracle Cluster Registry Export and Import Commands" to use manually created OCR export files to copy OCR content and use it for recovery. Its application is in surveys, answer sheets, questionnaires and ballots. Create the New Diskgroup in ASM for moving OCR, VotingDisk and SPFILE Oracle Grid Infrastructure Installation Guide for information about creating OCRs, Oracle Automatic Storage Management Administrator's Guide for more information about Oracle ASM disk group management. However, if you upgrade from a previous Oracle Clusterware release, then you can continue to use raw or block devices. This is called NETWORK HEARTBEAT. This is widely used for processing the large number of hand-filled forms which have to be processed quickly and with great accuracy. The ocrconfig -replace command requires that at least two OCR locations are configured. For example, if you have configuration problems that you cannot resolve, or if you are unable to restart Oracle Clusterware after such changes, then restore your configuration using the procedure for your platform. This section describes how to manage OCR and the Oracle Local Registry (OLR) with the following utilities: OCRCONFIG, OCRDUMP, and OCRCHECK. If you scroll through the key names below you will observe that most of the information pertains to the local resources required by OHASd (refer to the flow chart in the earlier post to see which values this file would hold). RAC heartbeat is the polling mechanism that is sent over the cluster interconnect to ensure all RAC. You must run the command as a user with administrative privileges. Repairing an OCR involves either adding, deleting, or replacing an OCR location. A high redundancy disk group must contain at least three failure groups. Ensure that the Oracle ASM disk group that you specify exists and is mounted. Optical Character Reader (OCR) is used to convert different types of documents such as scanned paper documents, PDF files or images captured by a digital camera into machine-encoded text. At this time VOTING DISK is used to communicate the node and trace information, which node is in the offline stage. Thus heartbeat of various nodes is recorded at different offsets in the voting disk. Is it illegal to lie about a felony on an application? At least three OCR locations, if OCR is configured on non-mirrored or non-redundant storage. You cannot inspect the contents of an export. 1. OCR manages Oracle Clusterware and Oracle RAC database configuration information, OLR resides on every node in the cluster and manages Oracle Clusterware configuration information for each particular node, Voting disks manage information about node membership. To view the contents of the OLR backup file: When you upgrade Oracle Clusterware, it automatically runs the ocrconfig -upgrade command. The main difference between OCR and Voting Disk is that OCR is used to convert scanned images of text into digital text, while Voting Disk is used to store the ballot information for an election. where path like '/dev/oracleasm/disks/%' and header_status = 'CANDIDATE'; 5. Your email address will not be published. WebOCR and Voting Disk. You must create an empty (0 byte) OCR location, or the Oracle ASM disk group must exist and be mounted. OLR is located on local storage on each node in a cluster. Few possible scenarios:1. Hi, I am working in IT industry with having more than 10 year of experience, worked as an Oracle DBA with a Company and handling different databases like Oracle, SQL Server , DB2 etc Check the location of OCR Disk from GRID Home with root user. The Oracle Clusterware has the OCR and voting disks open and is actively using them. You can store OCR and voting disks on Oracle Automatic Storage Management (Oracle ASM), or a certified cluster file system. For example: The default backup location for the OLR is in the path Grid_home/cdata/host_name. You cannot repair the OCR configuration on a node on which the Oracle Cluster Ready Services daemon is running. Successful addition of voting disk 34b3f9458e042b58eb8b601523fb6ef2. Look at output from the ocrdump command and determine whether it has your latest updates. It is located on the shared cluster system or a shared raw device file or Oracle ASM(11gr2 onwards) . To add OCR to an Oracle ASM disk group, ensure that the Oracle Clusterware stack is running and run the following command as root: You can run this command more than once if you add multiple OCR locations. Then each node uses its local copy of OCR and the local CRSd process to access it and communicate via the same local process if they need more updates from the physical OCR file.

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